Swedish Pot Roast

Brown a 5-lb rump roast on all sides in 2 TB butter mixed with 2 TB oil. Remove roast and center in casserole which has cover. Brown 1 cup finely chopped onions in butter/oil mixture. Add 3 TB flour, stirring well to smooth. At once, add 2 c beef stock, 1 TB dark corn syrup and 2 Tb white vinegar. Crush 1 tsp whole peppercorns and tie in cheesecloth. Place 1 large bay leaf and peppercorns in the casserole. Pour sauce over all. Cover and bake at 325-350 about 3 hours or until meat is tender.